tax-free shopping on the internet will be the focus of debate. states can only require stores to collect sales tax if the store has a physical presence in that state. the senate voted to take up the bill, which could pass as early as this week. the senate coverage on c-span2. homeland security secretary janet napolitano will be the sole witness. she was scheduled to appear last week. live coverage of the hearing in just under an hour on c-span radio and on c-span. those are some of the latest headlines on c-span radio. [video clip] >> the museum is meant to help a visitor relive the first eight years of the 21st century. the museum explains the decision-making process that i went through as president. and we hope the museum inspires people to serve, to serve their community or their country in some way. we really did not want to be a school. we wanted to be a do tank. i don't know if there is a lesson there. i do know that laura and i decided to go in a different direction with the -- apart from the museum with a component from which programs wou